Fuel cell



FIG. 1 is a perspective view of a fuel cell showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a side elevation thereof further illustrating a burner inphantom outline mounted upon the cell, said fuel cell being symmetricalabout its vertical axis; and,

FIG. 4 is a bottom plan view thereof.

The ornamental design for a fuel cell, as shown and described.